Elements, Compounds, and Mixtures
A sample of matter that has definite chemical and physical
Elements are pure substance that cannot be separated into
simpler substance by physical or chemical means.
We classify elements into the Periodic table:
Pure substance composed of two or more different elements
joined by chemical bonds.
Made of elements in a specific ratio
that is always the same
Has a chemical formula
Can only be separated by
chemical means, not physically
A combination of two or more pure substances that are not
substances held together by physical forces, not chemical
No chemical change takes place
Each item retains its properties
in the mixture
They can be separated physically
Can you identify the following?
Construct a table in your book with 3 columns, with the
headings element, compound, and mixture. You will be
shown a series of photos. Can you tell which of the three
headings each photo represents? Write the answers into your
An element contains just one type of atom.
A compound contains two or more different atoms joined
A mixture contains two or more different substances that
are only physically joined together, not chemically.
A mixture can contain both elements and compounds.